Source of funds and source of wealth: what Singapore banks ask

Source of wealth (SoW) is the origin of a customer's entire body of wealth: how they came to own everything they own. Source of funds (SoF) is narrower: the origin of the specific money or assets used to open or fund the account. A bank asks about SoF for most accounts as part of understanding the purpose of the relationship, and it must establish SoW as well when a customer is assessed as higher risk, which in practice includes most private banking and family-office relationships. This page explains the rules, the evidence banks typically request and what MAS said in 2024 and 2026 about keeping these checks proportionate. Rule references are to MAS Notice 626 (version dated 28 March 2024) and its Guidelines (March 2024 version).

Definitions and examples

The Guidelines to MAS Notice 626 define both terms and give examples of evidence. The table summarises them.

The Guidelines say a bank "should not limit its source of funds inquiry to identifying the other FI from which the funds have been transferred, but more importantly, the activity that generated the funds". A transfer from a well-known bank therefore still raises the question of what earned the money.

When banks must establish SoW and SoF

It helps to separate what the rules require from what has become standard practice in particular segments.

Paragraph 8.6 also requires banks to assess whether a company is higher risk if they cannot establish that it has visible operations, an economic purpose for its structure or substantive financial activity. Higher risk triggers enhanced measures; it is not a prohibition. If due diligence cannot be completed at all, paragraph 6.35 says the bank shall not open the account.

Evidence by type of wealth

The ACIP paper groups the SoW types that are hardest to corroborate into inheritances and gifts, business ownership, investment gains, sale of assets that cannot easily be valued, and employment income. The documents below are typical examples drawn from the MAS Guidelines and the ACIP paper; each bank decides what it needs.

For wealth built in another jurisdiction, banks may ask for translations or certified copies; the exact standard varies.

Companies and other entities

For a corporate customer the ACIP paper describes two levels. Tier 1 baseline due diligence looks at the entity itself: its revenue, profits, milestones and initial or seed capital. Tier 2 full due diligence extends to the ultimate beneficial owners and corroborates their wealth. Examples in the paper include requesting the entity's audited financials (with management accounts as an alternative for newly incorporated companies) and verifying against public registers such as ACRA or UK Companies House.

The paper also notes that the bank's view of a company can depend on its links to Singapore, for example whether an overseas company is actually carrying on business here. See corporate documents for the full company file.

Proportionality: what MAS said in 2024 and 2026

MAS has twice addressed how SoW checks should be calibrated. Circular AMLD 08/2024, "Establishing the Sources of Wealth of Customers", was issued on 26 July 2024. Circular AMLD 05/2026 followed on 25 May 2026, addressed to the chief executives of all financial institutions, so that Singapore's AML/CFT regime "does not create undue burden on legitimate businesses and investors". Its annex sets out three principles, each paired with practices MAS asks institutions to avoid:

The circular also says cases with red flags should be escalated to senior management, and that a working group co-led by MAS under the Private Banking Industry Group was set up "to improve account opening efficiency". These are expectations placed on financial institutions. They do not give customers a right to decline a bank's request, and a bank may still ask for more where it sees a risk-based reason.

Why scrutiny increased. On 4 July 2025 MAS announced composition penalties totalling S$27.45 million on nine financial institutions over AML-related breaches; MAS found that all nine did not detect or adequately follow up on significant discrepancies or red flags that should have cast doubt on some customers' stated sources of wealth. Bank information-sharing through COSMIC adds to this (see KYC and CDD). Together these explain why banks document their SoW reasoning carefully, and why the 2026 circular emphasises proportion rather than lower standards.

Organising what you already have

For the account itself, the bank mainly needs to connect the initial deposit to the activity that generated it, and to see that names, addresses and ownership percentages match across the application, registry records and tax forms. A short chronology of how the wealth was built, with certified translations where documents are not in English, usually answers the first round of questions; it helps the review but does not guarantee any outcome. Building a full wealth file that can be reused across banks, trustees and insurers is covered on hnwsolution.com.sg.

Never alter documents or route funds through other people's accounts to make a history look simpler; that is likely to end the application and can be an offence. For a pre-application checklist, see why applications stall or are declined; for how this fits the wider due-diligence process, see KYC and customer due diligence. If you need help organising a SoW summary for your situation, you can register your question through this site's contact options.